<template>
  <!-- action 必选参数，上传的地址  -->
  <!-- show-file-list 是否显示已上传文件列表  -->
  <!-- on-success 文件上传成功时的钩子  -->
  <!-- before-upload 上传文件之前的钩子  -->
  <!-- http-request 覆盖默认的上传行为，可以自定义上传的实现  -->
  <el-upload
    class="avatar-uploader"
    action="https://jsonplaceholder.typicode.com/posts/"
    :show-file-list="false"
    :on-success="handleAvatarSuccess"
    :before-upload="beforeAvatarUpload"
    :http-request="upload"
  >
    <img v-if="imageUrl" :src="imageUrl" class="avatar">
    <i v-else class="el-icon-plus avatar-uploader-icon" />
    <el-progress v-show="showProgress" type="circle" :percentage="percentage" class="progress" />
  </el-upload>
</template>

<script>
const COS = require('cos-js-sdk-v5')
// SECRETID 和 SECRETKEY请登录 https://console.cloud.tencent.com/cam/capi 进行查看和管理
const cos = new COS({
  SecretId: '',
  SecretKey: ''
})
export default {
  data() {
    return {
      imageUrl: '',
      percentage: 0, // 进度条显示数字
      showProgress: false // 是否显示进度条
    }
  },
  methods: {
    // 覆盖默认行为
    upload(res) {
      // console.log(res)
      this.showProgress = true
      cos.putObject({
        Bucket: 'cham-1306621576', /* // 存储桶的名称，必须 */
        Region: 'ap-beijing', /* 存储桶所在地域，必须字段 */
        Key: res.file.name, /* 文件名 */
        StorageClass: 'STANDARD', // 上传模式, 标准模式
        Body: res.file, // 上传文件对象
        onProgress: (progressData) => {
          // 进度条百分比
          this.percentage = progressData.percent * 100
        }
      }, (err, data) => {
        if (err === null & data.statusCode === 200) {
          this.imageUrl = 'https:' + data.Location
          // 关闭进度条
          this.showProgress = false
        }
      })
    },

    // 上传成功后
    handleAvatarSuccess(res, file) {
      this.imageUrl = URL.createObjectURL(file.raw)
    },

    // 上传之前的钩子函数
    beforeAvatarUpload(file) {
      const isJPG = file.type === 'image/jpeg'
      const isLt2M = file.size / 1024 / 1024 < 2

      if (!isJPG) {
        this.$message.error('上传头像图片只能是 JPG 格式!')
      }
      if (!isLt2M) {
        this.$message.error('上传头像图片大小不能超过 2MB!')
      }
      return isJPG && isLt2M
    }
  }
}
</script>

<style >
  .avatar-uploader .el-upload {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
  }
  .avatar-uploader .el-upload:hover {
    border-color: #409EFF;
  }
  .avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
    width: 178px;
    height: 178px;
    line-height: 178px;
    text-align: center;
  }
  .avatar {
    width: 178px;
    height: 178px;
    display: block;
  }
  .progress {
    position: absolute;
    display: flex;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #e4e4e4;
    border-radius: 50%;
    opacity: 0.9;
  }
</style>
